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    <!-- 使用for循环 - 求出班级里同学们平均年龄[15, 19, 21, 33, 18, 24] -->
     <script>
        let array=[15, 19, 21, 33, 18, 24]
        let a =0
        for (let index = 0; index < array.length; index++) {
            const element = array[index];
            a=element+a
        }
        console.log(a/array.length);
        
     </script>
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